Moritz Graf e64aa64c73 velero: implement three-tier backup retention policy ...

Replace single daily schedule (240h TTL) with three tiered schedules:
- daily-backup:   02:00 nightly,  192h TTL  → keeps last 7 daily backups
- weekly-backup:  03:00 Sundays, 1032h TTL  → keeps last 6 weekly backups
- monthly-backup: 04:00 on 1st,  4392h TTL  → keeps last 6 monthly backups

Kopia handles incremental deduplication at the block level automatically,
so each Velero backup only stores changed data despite being a full logical
snapshot. No additional incremental configuration required.

Update README with retention policy table and updated backup commands.

2026-07-01 17:28:11 +02:00

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